| Patent Number |
Title Of Patent |
Date Issued |
| 7568804 |
Highly efficient single panel and two panel projection engines |
August 4, 2009 |
| Single imager projection systems suffer from low light throughput, compared to three imager systems, because only one color band is illuminated at any one time. As a result, there is a need to increase the operating efficiency of the single imager projection system. The invention is |
| 7329006 |
Projection system having low astigmatism |
February 12, 2008 |
| Generally, the present invention relates to an apparatus for reducing astigmatism in a projection system that is particularly well suited to reducing astigmatism in LCD projection systems. A projection system includes a light source to generate light, conditioning optics to condition |
| 7237899 |
Highly efficient single panel and two panel projection engines |
July 3, 2007 |
| Single imager projection systems suffer from low light throughput, compared to three imager systems, because only one color band is illuminated at any one time. As a result, there is a need to increase the operating efficiency of the single imager projection system. The invention is |
| 7023602 |
Reflective LCD projection system using wide-angle Cartesian polarizing beam splitter and color s |
April 4, 2006 |
| An optical imaging system including an illumination system, a Cartesian PBS, and a prism assembly. The illumination system provides a beam of light, the illumination system having an f/# less than or equal to 2.5. The Cartesian polarizing beam-splitter has a first tilt axis, oriented to |
| 6786604 |
Projection system having low astigmatism |
September 7, 2004 |
| LCD projection systems that use reflective LCD imager units commonly use one or more polarization beamsplitters to separate the light incident on the imager from the light reflected by one or more respective imagers. The polarizing beamsplitters introduce astigmatism to the image light f |
| 6721096 |
Polarizing beam splitter |
April 13, 2004 |
| An optical imaging system including a wide-angle Cartesian polarizing beam splitter, light valve illumination optics having an f/#.ltoreq.2.5, and at least one reflective light valve. The Cartesian polarizing beam splitter (PBS) has a structural orientation defining fixed polarization ax |
| 6672721 |
Projection system having low astigmatism |
January 6, 2004 |
| Generally, the present invention relates to an apparatus for reducing astigmatism in a projection system that is particularly well suited to reducing astigmatism in LCD projection systems. A projection system includes a light source to generate light, conditioning optics to condition |
| 6525816 |
Method for measuring the absolute light throughput of reflective-mode displays in an optical sys |
February 25, 2003 |
| A method for measuring the absolute throughput of a polarization modulating reflective display in an optical system having a folded light path. The steps include measuring a first light intensity, L.sub.R, in the folded light path, having a first polarizing beam splitter, and a reflectiv |
| 6486997 |
Reflective LCD projection system using wide-angle Cartesian polarizing beam splitter |
November 26, 2002 |
| An optical imaging system including a wide-angle Cartesian polarizing beam splitter, light valve illumination optics having an f/#.ltoreq.2.5, and at least one reflective light valve. The Cartesian polarizing beam splitter (PBS) has a structural orientation defining fixed polarization ax |
| 5699139 |
Liquid crystal device having pressure relief structure |
December 16, 1997 |
| A liquid crystal display (LCD) having an active area for display of information and an inactive area adjacent the active area. The inactive area includes a pressure relief region for relieving pressure generated within the cell, thereby minimizing the effects of pressure variation in |
| 5686979 |
Optical panel capable of switching between reflective and transmissive states |
November 11, 1997 |
| A device, comprising a switchable optical panel and means for switching the panel between a reflecting state and a transmitting state. The switchable optical panel includes a transparent optically active layer having a first and a second major surface, a first reflective polarizer dispos |
| 5519539 |
Microlens array with microlenses having modified polygon perimeters |
May 21, 1996 |
| A microlens array and mold for making same in which the perimeter of each microlens is a modified polygon in that each edge of the lens approximates an elliptical arc, the ends of which terminate at the corners of the polygon, wherein the middle of the arc curves toward the center of eac |
| 5398125 |
Liquid crystal projection panel having microlens arrays, on each side of the liquid crystal, wit |
March 14, 1995 |
| A liquid crystal projection panel for use in a projection system. The projection panel is comprised of a large number of pixels of liquid crystal defining a image forming plane provided between two transparent substrates. Microlens arrays are provided on both sides of the projection |
| 5300263 |
Method of making a microlens array and mold |
April 5, 1994 |
| A method of making a microlens array and mold, and the articles made therefrom. The method involves forming a plurality of adjacent receptacles on a surface and partially filling the receptacles with a hardenable liquid, thereby forming a meniscus in each receptacle. A lens material can |
